Jeremy Strick in In the Light of Italy: Corot and Early Open-air Painting. Exh. cat., National Gallery of Art. Washington, 1996, p. 147, no. 34, ill. (color), dates it about 1800; remarks that the small town of Vicovaro lies in the mountains northeast of Tivoli; states that the composition resembles that of Bidauld's "Mountains and a Lakes" [now MMA 2003.42.4], while the paint handling is closer to that of Valenciennes or to Giroux, in a sketch painted over twenty years later, "Civitella" (private collection, Paris).
Valentina Branchini. "Simon Denis (1755–1813) in Italia: Dipinti e Disegni di Paesaggio." PhD diss., Università di Bologna, 2002–3, pp. 18–19, 118, 122–23, no. 55, ill., calls it "Vicovaro".
Geneviève Lacambre. "Two Series of Studies in Oil on Paper Numbered by Pierre-Henri de Valenciennes and Simon Denis." Studying Nature: Oil Sketches from the Thaw Collection. Ed. Jennifer Tonkovich. New York, 2011, pp. 74, 82, no. 98, calls it "Mountain Landscape at Vicovaro" and deduces that the number 98 on the verso situates it within the range of works similarly inscribed 78 through 127, whose primary motif is the earth with its vegetation.
Asher Ethan Miller. "The Path of Nature: French Paintings from the Wheelock Whitney Collection, 1785–1850." Metropolitan Museum of Art Bulletin 70 (Winter 2013), pp. 17, 45, fig. 19 (color).